Center js Button on New Reply/Thread

I have altered a hack with permission but I can't get it to work yet. Can someone help me with this? It will be much appreciated.

Vbcode.JS:


function center(theform) {

	centertext = prompt("center_text_prompt");

	

			theform.message.value += "
"+centertext+"
 ";

		else

			theform.message.value += "
+centertext+
 ";

		}

	theform.message.focus();






VBCodeLanguage:


center_text_prompt = "Enter the text you would like to center."; 
center_text = "Center your text.";



VB_Buttons Template:


<input type="button" class="bginput" value=" Center " onclick="center(this.form)" onmouseover="stat('center')" title="Center (alt+c)" accesskey="c">

[Platinumgamer]

Anyone?